package com.controller;

import java.io.IOException;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

@ServerEndpoint("/websocket")
@Component
public class WebsocketServer {

    static Logger log= LoggerFactory.getLogger(WebsocketServer.class);
    /**静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。*/
    private static int onlineCount = 0;
    /**concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。*/
    public static ConcurrentHashMap<Session, WebsocketServer> webSocketMap = new ConcurrentHashMap<>();
    /**与某个客户端的连接会话，需要通过它来给客户端发送数据*/
    private Session session;

    /**
     * 连接建立成功调用的方法*/
    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
        //this.userId=userId;
        if(webSocketMap.containsKey(session)){
            webSocketMap.remove(session);
            webSocketMap.put(session,this);
            //加入set中
        }else{
            //加入set中
            webSocketMap.put(session,this);
            //在线数加1
            addOnlineCount();

        }
        log.info("用户连接:"+session+",当前在线人数为:" + getOnlineCount());

    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        if(webSocketMap.containsKey(session)){
            webSocketMap.remove(session);
            //从set中删除
            subOnlineCount();
        }
      
        log.info("用户退出:"+session+",当前在线人数为:" + getOnlineCount());
    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息*/
    @OnMessage
    public void onMessage(String message, Session session) {
        log.info("用户消息:"+session+",报文:"+message);
    }
    /**
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("用户错误:"+this.session+",原因:"+error.getMessage());
        error.printStackTrace();
    }
    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) {
        try {
            this.session.getBasicRemote().sendText(message);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }



    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
    	WebsocketServer.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
    	WebsocketServer.onlineCount--;
    }
    
     public static void SendAllUserMessage(String message) throws IOException
     {
    	 for (Map.Entry entry: webSocketMap.entrySet()) {

    		 Session session  = (Session)entry.getKey();
    		 if(session!=null)
    		 {
    			 
    		 }
    		 session.getBasicRemote().sendText(message);
    	 }
    	 
     }
}
